Speed-measure.



1". R. G. & E. P. JOYCE.

SPEED MEASURE.

APPLIOATION FILED 1,111.16, 1907.

' Patented July 11,1911.

COLUMBIA PLANOGRAPH Co., WASHINGTON. DY Lf..

UNITED sTATEs PATENT oEEICE,

FREDERICK RICHARD CHURCH JOYCE AND ERNEST FREDERICK JOYCE, OF

`FARN'IBOROUGrH, ENGLAND.

SPEED-MEASURE.

Specification of Letters Patent.

Patented July 11, 1911.

Application led January 16, 1907. Serial No. 352,498.

' speed to another.

The invention also has in view to provide a construction which shall comprise few working parts and embody simplicity of construction and design with a maXlmum effectiveness in use.

In order that the invention and the man'- ner of carrying the same into effect may be clearly and readily understood reference is hereinafter made to the accompanying drawings in which Figures l and 2 are respectively front and back views of a speed measure according to this invention. Fig. 3 is a side view of a speed measure arranged as in Figs. l and 2.

In carrying our invention into effect, we construct of any suitable material a preferably circular, but which as hereinafter referred to, may be other shaped casing a provided with a dial b on which are set out a number of indicating circles or marks c, each intended to correspond with a certain speedl as will be hereinafter made clear. In the casing a is freely mounted a spindle d and upon the inner end of such' spindle is fixed centrally of its length a rod e and near each end of said rod e is loosely located a disk f and spiral spring g which are kept in place as by conveniently shaped screw-nuts 7L. In order to provide means for accurately dening the positions of the disks relatively to the indicating circles, a sharp edge is provided on the disks which may be centrally arranged as shown. By suitably connecting up the spindle d to some convenient moving part ofan automobile or the like the rod e will, on the engine being started, be rotated, and such revolution of the rod e will cause the loosely mounted disks f to move outward against the force of the springs gowing to the action of centrifugal force and, according toV the particular indicating circle coinciding with the circular path traced by such disks j",

the speed may be quickly and easily read,

as such indicating circles are suitably marked for this purpose and the`disks f would, as the speed reduces be pressed inwardly by the springs g. In order however that the person driving an automobile or the like may know the most advantageous moment to change from one gear ratio to another, two or more distinctive indicators are provided at distances from the center of the dial and from each other suitable for the particular kind of variable gear employed z'. e., so that each indicator will respectively indicate that speed of the car at which the gear thereof may be most advantageously changed from one speed to another.

Obviously any suitable mode of easily distinguishing the change speed circles :may

be adopted, for example by providing movable pairs of curved strips such as 1, jl and cl Fig. l, sothat one form of gage may, by adjusting such strips, be applicable todifferent types of change speed gears. As

shown by Figs. l to 3, the said strips are fixed to slides Z working in slots m and set by tightening the nuts a on the slide screws o, whereby, according to the dilferent speeds of the variable gear with which the indicator is to be employed, the pairs of strips 1 jl and k1 may be spaced the requisite distance from each other and from the center of the dial and then fixed by screwing up the nuts n.

Although a speed measure according to our invention has been described as having a circular casing and a circular dial the invention is not limited thereto and the details of the centrifugal device may be varied without departing from the spirit of the invention.

Having thus described our invention what we claim and Vdesire to secure by patent is 1. In a speed measure the combination of a. casing, a driving spindle rotatably mounted in said casing, a dial within said casing having a series of divisional speed marks struck from the center of said spindle, ya series of indicators distinctive from each other and from said divisional speed marks,

to said divisional speed marks, means for holding said indicators in adjustment, a member caused to gyrate by the rotation of said spindle, an indicating` member adapted to move away from the center of said spindle in proportion to centrifugal forces set up by said gyrat-ing member, and means for returning said indicating member to zero position.

2. In a speed measure the combination of a casing, a driving spindle rotatably mounted in said casing, a dial within said casing having a series of divisional speed marks struck from the center of said spindle, a series of indicators distinctive from each other and from said divisional speed marks and adapted to be independently adjusted radially with respect to said divisional speed marks, means for independently holding each of said indicators in adjustment, a member caused to gyrate by the rotation of said spindle, an indicatingmember adapted to move away from thecenter of said spindle in proportion to centrifugal forces set up by said gyrating member, and means for returning said indicating member to `zero position.

3. In a speed .measurey the combination of a casing, a driving spindle rotatably mounted in said casing, a dial within said casing having a series of divisional speed marks struck from the center orn said spindle, a series of indicators distinctive from each other and from said divisional speed marks, adapted to be adjusted radially with respect to said divisional speed marks, means for holding said indicators in adjustment, two oppositely arranged radial arms fixed to said spindle, a weighted member slidable on each of said arms, a spring device on each ot' said arms adapted to oppose the outward movements of said weighted members due to centrifugal forces set up by the gyartion of said arms, and means on said weighted members for deining their positions relatively to said divisional speed marks.

t. In a speed measure the combination of a casing, a driving spindle rotatably mounted in said casing, a dial within said casing having a series of divisional speed marks struck from the center of said spindle, a series of indicators distinctive from each other and from said divisional speed marks, and adapted to be independently adjusted radially with respect to said divisional speed marks, means for independently holding each of said indicators in adjustment, two oppositely arranged radial arms fixed to said spindle, a weighted member slidable on each of said arms, a spring device on each of said arms adapted to oppose the outward movements of said weighted members due to centrifugal forces set up by the gyration of said arms, and means on said weighted members for defining their positions relatively to said divisional speed marks.

In witness whereof we have hereunto set our hands in presence of two witnesses.

FREDERICK RICHARD CHURCH JOYCE. ERNEST FREDERICK JOYCE. Witnesses:

HENRY CONRAD I-IEIDE, ALBERT GEORGE BARNES.

Copies of this patent may be obtained for five cents each, by addressing che Commissioner of Patents, Washington, D. C. 

